I have a simple Jandy valve splitting the main drain from 2 joined skimmers. When I switch to 100% main drain then it pulls fin, no air in the lines, when I switch to split or 100% skimmers it will hold for a second but then it looks like the air "breaks" into the pump basket. I say breaks because you can feel the pressure pulse come through. IT will generally plug off and start to cycle out the air and then it comes back. It seems like if it goes above a certain line pressure it will suck air. Because of this I cannot vacuum or use the skimmers at all. Any suggestions or redirection are most appreciated.
1.5" suction/return lines
Pentair 348023 SuperFlo Energy Efficient 1HP Single Speed Pool Pump, 115V/230V
Hyaward DE filter
25000 gal gunnite with 2014 replaster
2 skimmers and 2 inlets